With music composed by Pierre Villette, O Salutaris, Op.21 is a an Eucharistic hyhmn written for the Feast of the Corpus Christi, for SATB choral a cappella. Dedicated to Jules Lambert, director of La cantate in Rouen, this religious piece is very lyrical and melodious.

Written in Latin, this piece necessitates being sung at a slow tempo (58), including three principal verses and finishing with the voices in harmony. It is mainly used for the Adoration and the Blessed sacrament.

Pierre Villette (1926-1998) was a French composer of choral and instrumental music. Strongly influenced by Catholicism, his musical heritage ran from Fauré to Messiaen.